Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8477fdb22d243fb…

MALICIOUS

PDF

46.7 KB Created: 2021-05-11 07:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 815dda41917ac6961e996ef4757eebc1 SHA-1: 4d790d1d00c47a9592f736cfe0456283c320b6c0 SHA-256: c8477fdb22d243fb9335cd29ec5711e47bbfa98ff525bc4002eabfdd931bc5f3
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" or "free generators". The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic. The presence of a fake CAPTCHA heuristic further supports the intent to trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/robux-com-roblox-game-hack In PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/robux-website_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn2lamtim.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bfe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFE 25720 bytes
SHA-256: 71856f603deb601b72de352b6e9b6eda77d069f60d71fba43dd72aab636bd06e
font_01_sfnt_off000087ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9493 18184 bytes
SHA-256: f7ab4603df043e3b409a5778cbcaa649af363bace0b439e4e1e45451ac3c723c

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